156 BITTIUM. 



B. ALTUM, Sowerby. PL 31, fig. 26. 



Pale fawn color, with white varices, spirally banded with chest- 

 nut, minutely decussated by spiral and longitudinal lines. 



Length, 23 mill. 



Hob. unknown. 

 B. OOSIMENSE, Watson. PI. 30, fig. 12. 



Whorls flatly sloping, with about 13 oblique longitudinal ribs, 

 and narrower interstices, the ribs terminating on the spire whorls 

 in a spiral tuberculated angle, just above the suture, on the body 

 whorl becoming gradually evanescent below the angle, spirally 

 striate throughout ; brownish grey, suffused with ruddy brown, 

 with white spots where the spiral sculpture crosses the ribs. 



Length, 5 mill. 



Oosima, Japan. 

 B. AMBOYNENSE, Watson. PL 30, fig. 15. 



Whorls with about 20 rounded ribs and narrower interstices, 

 crossed and divided into rounded tubercles by three or four spiral 

 furrows, a smaller spiral thread just above the suture and on the 

 middle of the body whorl, below this, on the latter, the sculpture is 

 continued, but fainter; pale yellowish brown. Length, 3'5 mill. 



Amboyna. 

 B. DIPLAX, Watson. PL 30, fig. 14. 



With 10-15 small, narrow riblets, with much wider interspaces, 

 crossed on each whorl by two spiral riblets, forming nodules at the 

 intersections, and causing each whorl to have a sloping angle above 

 and below, and a concave flat area between the spirals, base of body 

 whorl with three or four additional, non-tuberculated riblets ; white 

 or sandy, with a chestnut tinge towards the apex. Length, 25 mill. 



Amboyna. 

 B. CYLINDRICUM, Watson. PL 30, fig. 18. 



With about twenty-five longitudinal riblets separated by subequal 

 interspaces, and crossed by three threads, which expand into 

 depressed, rounded tubercles, below the middle of the body whorl 

 the surface is smooth, the pillar defined by a minute spiral thread. 



Length, 6'5 mill. 



Sydney, N. S. Wales. 

 B. PUPIFORME, Watson. PL 30, fig. 22. 



With about twenty-five proximate tuberculated ribs, and three 

 spiral threads on each whorl, and a strong sutural furrow ; shell 

 solid ; translucent, glossy white. Length, 2*5 mill. 



Cape York, Australia. 



